IPA: /ˌkoʊlɪˌsɪstəˈkaɪnɪn/
KK: /kəˌlɛsɪstəˈkaɪnɪn/
A hormone made mainly in the small intestine that helps digest fats by causing the gallbladder to release bile and the pancreas to produce digestive enzymes.
Cholecystokinin plays an important role in the digestion of fats after a meal.
Cholecystokinin is formed from "chole" (from Greek "chole", meaning bile), "cysto" (from Greek "kystis", meaning bladder), and "kinin" (from Greek "kinein", meaning to move). The word refers to a hormone that stimulates the contraction of the gallbladder to release bile, thus facilitating digestion.
Think of 'bile' ('chole') being stored in a 'bladder' ('cysto') and then 'moving' ('kinin') to aid in digestion.
No commonly confused words.